I managed to fix some shader mistakes and update corresponding values in the map itself. After loading the map back, it managed to get broken - all textures except for common spog textures appear to be missing in Radiant. I even tried to load up backup copy, but it doesn't do anything, textures are still broken. Not only custom textures used in this particular map, but every other texture, including original stock Quake 3 textures. Something went wrong and I can't figure out what

This is what the map looks like:

Temporary Troubleshooting Release, download link: ZIP [ 304 MB : includes .pk3 with all textures and shaders, and the map file itself ] [ Password: hellboy ]
Don't forget to add all non-empty shaders in your shaderlist in order to see shaders in Radiant working (with tiny white border).
If you locate something that could possibly cause the textures seem missing, let me know, please. I might overlook something, but really don't know what it could be, I found nothing that could cause the assets go corrupted

P.S. - sorry for double post, however, original reply post in Schöna topic in LEM doesn't seem to get attention

I'll try to find solution myself, however, I do not have much time to do so. I'm currently seeking for a job and can't really play games right now...